Preparation of 4-basically substituted 2-sulphanilamidopyrimidines



Patented July 9, i946 ;.1? v

. "UNITE-oz..s'r fr s PA E T;- OFFICE V PREPARATION of 4.-BA s'roKilIlii"sUBsT1-; I

TUTED '2-SULPHANILAMIDQPYRIML I DINES 1- j;

Jackson P.-English, Stamford, Conn, assignor to American Cyanamid Company, New York, N. Y., a corporation of Maine No Drawing. Application July 17, 1944, Serial No.'545,395

- 6 Claims. (Cl. 260239.6)

This invention relates to the preparation of with or without a solvent at a temperature sulphanilamido pyrimidines. More particularly of about 50 C. to about 200 C. for from it relates to the preparation of 2-sulphani1amidoabout one-half hour to about four hours depend-' 4-aminopyrimidines. V ing on the temperature used. The crude reac- I have discovered that when 2-sulphanilamido- 5 tion product may be isolated an purified by ex- 4-alkoxypyrimidines are heated with ammonia I traction with dilute alkali, filtration and precipior amines having a, reactive hydrogen, reaction tation from the alkaline solution by neutralizaoccurs resulting in the formation of 2-sulphaniltion. The crude product may also be purified by amido-4-(amino or substituted amino) pyrimisuspendingit in water, filtering and recrystallizdines having the following structural formula: ing from aqueous solution.

X My invention will now be illustrated in greater 7 detail by means of the following specific examples, V which are given. for purposes of illustration and Y I are not to be consideredas limiting my invention N G m I in which X and Y are hydrogen or alkyl and substituted alky1 radicals such asalkoxyalkyl, 49 Parts of z'sulphanflamldo'4'methoxypynm' cyanoalkyl, aralkyl, dialkylaminoalkyl, etc. idine were mixed with 400 parts of methanol It can readily be seen in the above formula that and 200 parts of anhydrous ammonia and heated 15 to the particular details described therein.

2 V Example 1 when the 2-sulphanilamido-e-alkoxypyrimidine or one hour at110 C. in an autoclave. After is reacted with ammonia, then X and Y are hyl ng a d the release of pressure, t e alcohol drogen; when a primary amine such as methyl- W S evaporated e P 0- iamine is used, t 1 t-1 71 and Y i hydronopyrimidine was obtained by extraction of the gen; and when a secondary amine, is used such residue with dilute alkali and precipitation from as dimethylamine, both X and Y are methyl. the alkaline solution by neutralization. A yield These compounds are useful as chemotherapeuof 23 parts was obtained melting with decompositic agents and, also, as intermediates in the preption t to T aration of other compounds.

The present invention 'is not particularly con- Example 2 cerned with the method by which the 2-sulphanil- 80 parts of 2-sulphanilamido-4-methoxypyrimamido--alkoxypyrimidine is produced and it may idine and 33 Parts O v y in p py be produced by any suitable process. These commine were heated together at 110 C. for 45 minpounds have been prepared by reacting p-nitroutes; 'I'h'e semi-liquid reaction mixture gave off 7 benzene sulphonyl chloride with 2-amino-4-algas and set to a solid. The reaction product was koxypyrimidines followed by reduction to produce suspended in water and filtered. The solid 2- 2-su1phanilamido-4-alkoxypyrimidines. su1p a i O -(gamma diethylaminopropyl- Illustrative examples of the amines which may amino) pyrimidine was crystallized from water be used in carrying out the invention are as foland had a melting point of 230 to 232 C.

lows: methylamine, ethylamine, propylamine, 40 I claim:

butylamine, isopropylamine, amylamine, hexyl- A method of preparing p a 1am d0-4- amine, phenethylamine, cyanoethylamine, phepyrimidines which compr e heating noxyethylamine, ethoxyeth'ylamine, diethylamigether a sulphanilamido4-alkoxypyrimidine,

noisoamylamine, diethylaminopropylamine, dihaving the formula methylaminopropylamine, dipropylaminopropylamine, dipropylaminobutylamine, etc. N OR When my invention is carried out using am- NHEOSOKNEF monia or a volatile amine, it is preferable to use N a solvent such as methanol, ethanol, propanol, V butanol, etc., and to conduct the reaction in. a in Which R s n alkyl a al, and a member of closed vesse1 such as an autoclav the class consisting of ammonia, primary amines In carrying outithe invention, the amine is n Secondary amines- V heated with a 2-sulphanilamido-4-alkoxypyrimi A m od of p ep P n id0- dine such as 2-sulphanilamidor4-methoxypyrimiaminopyrimidines which comprises heating to-- dine, 2-.-sulphanilamido-4-ethoxypyrimidine, etc.', gether at a temperature between 50 and 200 C.,

5. A method of preparing 2-su1phani1amido-4- aminopyrimidine which comprises heating together 2-su1phani1amido 4 methoxypyrimidine and ammonia.

6. A method of preparing 2-sulphani1amido-4- (y-diethy1aminopropy1amino) pyrimidine which comprises heating together 2-su1phani1amido-4- methoxypyrimicline and V-diethylaminopropylamine. i

JACKSON P. ENGLISH. 

